题干
--- What happened?
--- I am under the weather. I think I should go to see a doctor.
A：feel very sad
B：don't feel well
C：feel comfortable
答案(点此获取答案解析）
B
--- What happened?
--- I am under the weather. I think I should go to see a doctor.
A：feel very sad
B：don't feel well
C：feel comfortable
和
，
后测得密闭容器内的压强是起始时的0.9倍，在此时间内
是